Cymro-

The root of the Cornish language was the same as that of the Welsh language, but largely amalgamated with the Saxon; […] Every vestige of this old Cymro-Saxon jargon has however past away, except it be indeed the use of a few pronouns decidedly Saxon.

1838 March, Sylvanus Urban (pseudonym), review of The Parochial History of Cornwall, in The Gentleman’s Magazine, volume IX, page 274

Formerly Mr Driscoll held court at that bastion of Welsh nationalism, The Cayo Arms, on Cardiff’s Cathedral Road, where he could be consulted on any matter concerning Cymro-Irish relations as long as an element of rugby football was included in the conversation.

2010 July 15, Graham Henry, “Irish 'consul' holds court at new HQ”, in (Please provide the book title or journal name), Western Mail

From B.C. 390, to B.C. 900, is the fall and rise of the Etrurian or Tyrrhenian empire, of the establishment of the Cymro-Gallic empire in Northern Italy, and of the Etrurian domination in Rome

1862, Britannicus (pseudonym), “Vindication of the mosaic ethnology of Europe”, in The Cambrian Journal, page 149

Some people derive Berwick from the Cymro-Teutonic compound Aber-wick. This sounds most reasonable, Aber signifying the mouth of a river, while some of the Saxons whom Ida gathered into one kingdom certainly then or later had a "wick" or town here. The Celts would naturally have emphasized the penultimate and made it Aberwick [...]

1909, A. G. Bradley, The Romance of Northumberland, page 137